The company seems to have landed on a winning business model: A pay-as-you-go program that charges by usage rather than seats, on a platform that is feature rich and easily configured.

Now the company, which has been cash-flow positive for all of its five years, has hit a new milestone, teaming with mobile internet service fring, essentially a central switchboard for IM and IM-based VoIP that connects Skype, AIM, Yahoo, and various other providers—plus SIP-based services. fring doesn't care whether your Internet connection is via cellular data or Wi-Fi network.

Junction Networks CEO Mike Oeth says the incorporation of fring services into its network—made possible by its SIP stack—could give a mobile device full desk-phone functionality, easily and transparently.

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